Downward-facing dog is a common yoga pose that stretches and strengthens the body. To perform this pose, start on your hands and knees, then lift your hips up and back, forming an inverted V shape. Your hands should be shoulder-width apart, and your feet should be hip-width apart, with your heels reaching toward the ground. This pose helps to elongate the spine, stretch the hamstrings, and open the shoulders. It also promotes blood flow to the brain, which can enhance focus and relieve stress. Practicing downward-facing dog regularly can improve overall flexibility and strength.